Stay in US beyond I94 date due to medical reason

It will require long explanations to answer questions. It might be better to get a second opinion if your company attorney is not willing to explain.

US citizen wife unemployed can the intending immigrants assets be used?

You can read the instruction for Affidavit of Support. It will tell you what kind of assets can be used.

2-months unemployment rule of USCIS for OPT students..

You can call USCIS and ask about the case status since its been over 90 days. Once your OPT is approved, the unemployment period will begin to accrue.

How to proceed with priority date being current once more?

You can contact USCIS and ask about the case status. Generally, they need 30 to 60 days to process I-485 once your priority date becomes current....

Does the email of the NVC mean that the consulate would reject me from obtaining the immigrant visa?

It looks like you counted 3 people for the purpose of I-864 income. You probably want to double check numbers with an immigration attorney as the...

Can my savings be acceptable to reach 125% of poverty guideline without needing a co sponsor?

If you have enough savings to cover the difference x3 then that would be sufficient.

How many Specific days I would have if my H1b extension based on RFE is denied , to leave country or COS to F1?

Unfortunately, there is no grace period. You probably want to speak to an immigration attorney to see if you have other options.

You can re-apply but you need to overcome the reasons of the prior denial. Since you have to pay the filing fees again, maybe it is better to hire...

Does age matter for issuance B-2 visa? (I'm Iranian)

There is no age restriction. However, the visa issuance is determined by a consular officer. If the consular officer thinks you are not coming back...

I want to change my visa into language visa. What should i have to do to get the visa.

You need to change to F-1 status. Contact few schools and see what they offer for international students.